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Author Question: What do we mean by the half-life of a radioactive isotope? A) it is the amount of time a person ... (Read 92 times)

jace

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on: Jul 27, 2018
What do we mean by the half-life of a radioactive isotope?
 
  A) it is the amount of time a person can be exposed to radiation without getting sick
  B) it is the time for half the number of radioactive nuclei to become stable nuclei
  C) it is the amount of time for half of the nuclei to become radioactive
  D) it is the time for half the number of radioactive nuclei to decay

Question 2

A handball of mass 0.10 kg, traveling horizontally at 25. m/s, strikes a wall and rebounds at 19. m/s. What is the change in the momentum of the ball?
 
  A) 4.4 N-s
  B) 72 N-s
  C) 1.2 N-s
  D) 1.8 N-s
  E) 5.4 N-s


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bookworm410

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Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

A


jace

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Reply 2 on: Jul 27, 2018
Gracias!

patma1981

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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